linux-kernel - Re: [PATCH] riscv: vector: fix xtheadvector save/restore

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Message-ID: <aC_oTWjLMUfgKeIK@ghost>
Date: Thu, 22 May 2025 20:15:25 -0700
From: Charlie Jenkins <charlie@...osinc.com>
To: Han Gao <rabenda.cn@...il.com>
Cc: linux-riscv@...ts.infradead.org,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>,
	Jesse Taube <jesse@...osinc.com>, Andy Chiu <andybnac@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] riscv: vector: fix xtheadvector save/restore

On Fri, May 23, 2025 at 01:27:01AM +0800, Han Gao wrote:
> Fix [1] save/restore vector register error
> 
> Link: https://lore.kernel.org/all/20241113-xtheadvector-v11-9-236c22791ef9@rivosinc.com/ [1]
> 
> Signed-off-by: Han Gao <rabenda.cn@...il.com>

Thank you!

Reviewed-by: Charlie Jenkins <charlie@...osinc.com>

> ---
>  arch/riscv/include/asm/vector.h | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/riscv/include/asm/vector.h b/arch/riscv/include/asm/vector.h
> index e8a83f55be2b..7df6355023a3 100644
> --- a/arch/riscv/include/asm/vector.h
> +++ b/arch/riscv/include/asm/vector.h
> @@ -200,11 +200,11 @@ static inline void __riscv_v_vstate_save(struct __riscv_v_ext_state *save_to,
>  			THEAD_VSETVLI_T4X0E8M8D1
>  			THEAD_VSB_V_V0T0
>  			"add		t0, t0, t4\n\t"
> -			THEAD_VSB_V_V0T0
> +			THEAD_VSB_V_V8T0
>  			"add		t0, t0, t4\n\t"
> -			THEAD_VSB_V_V0T0
> +			THEAD_VSB_V_V16T0
>  			"add		t0, t0, t4\n\t"
> -			THEAD_VSB_V_V0T0
> +			THEAD_VSB_V_V24T0
>  			: : "r" (datap) : "memory", "t0", "t4");
>  	} else {
>  		asm volatile (
> @@ -236,11 +236,11 @@ static inline void __riscv_v_vstate_restore(struct __riscv_v_ext_state *restore_
>  			THEAD_VSETVLI_T4X0E8M8D1
>  			THEAD_VLB_V_V0T0
>  			"add		t0, t0, t4\n\t"
> -			THEAD_VLB_V_V0T0
> +			THEAD_VLB_V_V8T0
>  			"add		t0, t0, t4\n\t"
> -			THEAD_VLB_V_V0T0
> +			THEAD_VLB_V_V16T0
>  			"add		t0, t0, t4\n\t"
> -			THEAD_VLB_V_V0T0
> +			THEAD_VLB_V_V24T0
>  			: : "r" (datap) : "memory", "t0", "t4");
>  	} else {
>  		asm volatile (
> -- 
> 2.47.2
>